Adding and recording machine.



B. DYSART.

ADDING AND RECORDING MACHINE.

APPLIOATIO'NiILED JULY 12, 1909.

Patented June 2-, 1914,

5 SHEETS-SHEET 1.

liimlzzozv flir'ne a Zyearz B. DYSART.

ADDING AND nnconnmu MACHINE.

APPLICATION FILED JULY 13, 1909.

Patented June 2,1914;

6 SHEETS-SHEET 2.

B. DYSART.

ADDING ANDREGORDING MACHINE.

APPLICATION FILED JULY 12, 1909.

1,098,714, I Patented June2,1914.

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B. DYSART.

ADDING AND RECORDING MACHINE.

APPLICATION FILED JULY 12, 1909.

Patented June-2, 1914;

5 SHEETS-SHEET 4.

B. DYSART. ADDING AND RECORDING MACHINE.

APPLI-OATION TILED JULY 12, 1909.

Patented June 2, 1914.

BIRNEY DYSARI, OF ST. LOUIS,

I IEISSOURI, ASSIGNOB, TO DALTON ADDING MACHINE COMPANY, 0F ST. LOUIS,MISSOURI, A CORPORATION OF MISSOURI.

ADDING: AND RECORDING MACHINE.

1,uv8,7ist.

Specification of Letters Patent.

Application filed July 12, 1909.

Patented June I6, 1314.

Serial No. 507,274.

To all whom it may concern:

Be it known that I, Bmnnr Drsnnr, a citizen of the United States,residing at St. Louis, Missouri, have invented a new and useful Addingand Recording Machine, of which the. following is'a specification.

This invention relates to adding and re.- cording .machines, and oneobject of this invention is to produce an adding machine having anadding mechanism operable to perform adding functions, such as carryingthroughout, and provided with mechanism whereby carrying may beinterrupted at any predetermined point in the adding mechanism.

Another object is to provide a machine comprising numeral keys, amechanism operable to add numbers struck on the keys, in combinationwith mechanism for operating said adding mechanism effectively todetermine and represent a. number which is the remainder or differencebetween the number or total represented in said adding mechanism andanother number subsequently struck on the keys, said adding mechanismhaving only operation to perform both adding and sub tracting functions.

Another object is to provide mechanism in an adding machine whereby,after the minuend has been introduced into the adding mechanism,transferring or carrying may be interrupted in the next-higher orderfrom the minuend so as to enable subtraction to be performed by the useof the complementary number of the subtrahend extending only to theorder to which the minuend extends, irrespective of the value of such.

order. 3

In a companion application I have shown and described mechanism for usein mathematical calculations involving subtraeti on in which the entireadding mechanism is brought into use at each operation for subtraction,all that part of the adding mechanism in higher orders from the minucndbeing operated to receive complementary We of the subtrahend, so thatwhen the subtrahend complement is introduced into the adding mechanismcarrying or transferring will be performed throu hout the addingmechanism, clearing that portion of the adding mechanism above thehighest order of the remainder.

The presentinvention differs from that one direction of disclosed in thesaid companion application in dispensing with the use of thecomplementary 9s beyond the highest order of the minuend, and anotherobject of the invention is to produce mechanism whereby carrying ortransferring may be interrupted at the proper point in the addingmechanism to enable the operator to perform calculations in this way.

As in the said companion application, the key board of the machine inwhich my present invention is embodied, includes a set of keys havingtwo sets of figures thereon, one set of which indicates the positivevalue of the key and the mechanism to be operated thereby, and the otherthe complementary value of the key, which enables the operator readilyto select the proper keys for setting up the subtrahend complement inall cases of subtraction.

In addition to the foregoing specified objects and advantages, otherswill appear from the following description in which reference is made tothe accompanying drawings, in which-- Figure 1 is a side elevation of anadding and recording machine of a well known type, with part of the casebroken away or removed to disclose parts of the present subject matter.I? is a diagrammatic plan or chart illustrating the arrangement of thekeyboard in which the figures uppermost on the several keys indicate thepositive values of the keys, and the figures below indicate thesubtrahcnd or negative values. Fig. 3 illustrates a specimen or exampleof subtraction in which the minuend and Subtrahend and remainder arerecorded. Fig. 4:

illustrates a. complete example of subtraction in which the subtrahcnd,the minuend, the minuend complement and the remainder are recorded. Fig.5 is a vertical sectional view of the rear portion of the machineshowing parts of the present invention. Fig. 6 is a vertical sectionaLxicof the rear p .ion of the machine at the right hand side. Fig. 7 is arear elevation showing the relation of the subject matter of the presentinvention with respect to the other operating parts. Fig. 8 is aperspective view of the devices employed to interrupt carrying ortransferring in the adding mechanism. Fig. 9 is perspective view of oneof the stop devices whereby the carrying is interrupted. Fig.

10 is an enlarged view showing the normal position. the devices forinterrupting cerryin g. 11 illustrates sold devices sojuste'ci toprevei'it carryii'i Fig. 12 is a view similar to Fig. 11 showing thereturn de vices in engagement with the stops by which cerrying isinterrupted.

The greater portion of the mechanism contained in the adding machinewith which it have illustrated my present invention is disclosed in theapplication of Hubert Hopkins, Serial No M0390, January 2%, 1903 thecorresponding British Paterit No. 85 of 1904i, and these machines arealso Well. known commercieily at the present time. Tie said machinesinclude a keyboard comprising a set of ten keys 1 having leversextending rearwardly and provided at their rear ends with verticalextensions or hammers 2i rails 3 '5; 6 and 7 extending transverselyabove the rear en s or the key ievers s carriage i is mounted, havingsuitable snti-f1-icti011d vices 5 operating on. the mils. The oer riegeis p; yided with at rock 6 projecting leftwerdiy with respectto theoperator and in .mesh with e gear segment 7 rigidiy etteched tothe-upper end of s. vertical sheft 8, An escepement her 9 rests upon thehey ievers one is provided with escsper'nent device 10 engaging with otooth segment 11' etteched to the shaft 8. testes lettvwrdiy Y and it isstepped along from. left when the keys are operated movement being ted iopera on the escalpement l0, g Viithifi the cerriege rows of pins 3.nioyehly carried, in posi row of pi the ieit ere sup- .inirhedicteiyshove extension 2 hey Wili move or in, in the carriage, n theescepenient to he moved one u suilicieiit to bring iron oi pins overtheends of the v ere. This operation is repeat-ed ieriefvsr any key is andis Well. own in, -.dding mach nes or the cross cerwage type Thesemachines also include o series rocks 14;- suspendcd by Verticalextensions from the shaft and ci'innectcd type carriers 16 pinend-slotconnections ii, The type also swing; from the shaft and through the pinand slot connections have u certain independent movement Withoutcorresponding movement Each type carrier tension 18.

is i

on the part the rec is provided Wi at rearward with resoect .etrms 2Gswing have so or cross 65 front of the A spring 12 ec;'

and type carriers, and holding them normally in idle position.Extensions oi the arms support a rod 22 which is connected With theextei'isions 18 or the type carriers by means of springs 23, from whichit follows that when the arms 20 are swung forwardly the springs 23 willtend to actuate the type carriers forwardly. The springs 19 will tend todetain the racks until, the type carriers reach the iimit of their independent movement permitted by the pinand-slot connect-ions 1'1, forwhich the racks also will be moved. i

When any number has been set up the carriage by operation. of the keysas above described, the arms 20 end the cross piece 21 supported therebyare swung forwardly and the type cerriers'end reeks also move untilfurther movement thereof is stopped by engagement of heels 2A on theracks with the pins 13 Whichhave been set up in the cor-- risge. Thismovement is arranged to be suiiicient to shoe the 25 on thetype cerriersin proper recording position aidjecent to the plat-2:126 w iereonrecords may be made by driving the type to print through operetiori ofthe springimpelled henr mers 2? Adding mechanism 28 veoinprising a setof Wheels mounted upone shaft 29 are arranged to with the racks on.their return movement and thereby receive and add the number which hadbeen set up in the carriage and record The carriage supports a plate 30Whose rear edge s normally in front of the heels 24. As the is steppedacross the machine the piste 30 lOVGS successively from in front of the.s 242 reieasing one rock each step, so i many reeks will be free tomove were digits in the. number tne keys. Upon opera tion of the racksand carriers to record and odd the nurnl'ier which has been representedin the carriage, all these rocks and type carriers which are notnecessary will be detained from operation. by the plate 30.

Carrying from lower to higher orders in the adding Wheels is effected byinovii'ig the reeks 1 rezirwverdiy short distance beyond their idleposition whenever carrying is necessaryn such resuit being accomplishedthrough any weii known tripping devices which he used in coune tion withthe adding whee In these machines the carry ing or transferringmechanism is continuous from the lowest to highest orderyso thatcarrying he accoupiished throughout the adding inechanisu or at anypoint therein whenever it is necessary to produce the correct result orsets he cor yir- 18 i in these machines in suhstun. vflier in themachine 0' y causing by reg} their springs 19. The trips actuated by theadding wheels, whereby this carrying or transferring is permitted, arenot shown, and are not affected by the present inven 5 tion, but onlythe racks themselves are affected, being held and prevented fromcarrying at the desired point. These devices for holding of the racksand preventing them from carrying or transferring I have termed meansfor interrupting the carrying or transferring. I employ this term in itsbroadest sense, and mean and include thereby any devices or elementswhich will cooperate with the adding wheels or their actuat- 5 ing rackseffectively to stop, prevent or interrupt carrying beyond any selectedorder above or beyond which carrying or transferring would be effectedexcept for manipu lation of said means. Adding machines of this type aswell as others, are frequently employed to perform examples, so called,of subtraction. These examples really are examples of addition in whichthe subtrahend is introduced into the machine by its complement up tothe full capacity of the adding mechanism. By complement, used in thissense, is meant that number which added to the subtrahend will addbeyond the capacity of the machine and restore all of the adding wheelsto idle position.

Referring to Figs. 3 and 4 for further illustration, the number Arepresents the minuend which has been recorded and introduced into theadding mechanism; the number B represents the subtrahend which has beenrecorded but not added and is to be subtracted from the minuend. In themachines of the cross carriage type at 10 resent on the market, sofar asI am inormed, and in many or all other adding and listing machines,subtraction would be performed by introducing into the adding mechanismthe full complement of the number B and adding said complementary numherto the minuend A, which would be effective to produce and retain withinthe adding mechanism the remainder or difference between the .minuendand the subtrahend. Assuming that there were six orders in the addir gmechanism, the complement of the number 13 as shown requires that 9 beintroduced into the adding mechanism in the highest order, thecomplement of the subtrahend' being at the same time intr0-' duccd 'intothe lower orders will cause the jadding mechanism to be operated toposition and represent the difference between the ,4 mi'nuend and thesubtrahend. Should the 60, adding mechanism extend beyond the sixth*ijrder to which the minuend extends. it is necessary in the machines atpresent in use to introduce 9s to the left of the subtrahend complementup to the highest order of the adding mechanism, which operation istedious and requires care on the part of the operator to avoid mistakes.The complementary 9s are necessary in ordcrthat when carrying iseffected beyond the highest order of the minuend all the adding wheelsin higher orders will be returned to idle position in order that thewheels of the lower orders may properly represent the remainder ordiiference.

My present invention overcomes the necessity for introducing the fullcomplement of 9s by interrupting carrying beyond the highest order ofthe minuend, and requires only that the operator shall introduce 9s inhigher orders from the subtrahend only to the highest order of theminuend. This is illustrated in Fig. 4 in which the minuend extends tothe 6th order and the subtrahend B to the fifth order, in which instanceit is necessary only for the operator to introduce into the machine one9 followed by the five complementary orders for the subtrahend.

In carrying out this invention, I provide a key 31 extending through aslot in the front of the case, and having its lever resting upon aprojection 32 on the bell crank lever 33. A link 3% connects theopposite arm of the bell crank lever 33 with an arm 35 attached to therock-shaft 36 at the rear of the machine. (Fig. The rock shaft 36 isencircled by an eccentric sleeve 37 which in turn is encircled by asleeve 38. At one end of the sleeve 38 is a forwardly projecting arm3.)having a roller 40, said arm 39 being provided also with a downwardextension 41. The opposite end of the sleeve 38 has an arm 42 attachedthereto corresponding to the arm 41 and between the lower ends of saidarms bar 43 is attached. To said bar 43 a plate id is secured, saidplate being provided with a series of depending arms having rearwardextensions 45 .at their lower ends. A shaft 40 rearward from the arms ofthe plate at supports a series of stop members 47 which projectforwardly between the arms of the plate 44, each of said stops having ashoulder 48 above the shaft l6 and a lateral shoulder 49 below saidshaft.

The stop members 47 (Figs. 6, l0 and 11) have two notches 50 in theirrear ends, which are engaged by detent springs 51 whereby said stopswill be held in their two adjustments, but may be forcibly moved fromone adjustment to the other as required in operating the machine. Thebar 43 has its lower edge extended rearwardly as shown in Fig. 6. Aspring 52 'actuates and holds the link 34: in its rearward position,also holding the shaft 36 in position so that the eccentric sleeve 37 onsaid shaft occupies substantially the position shown in Flg. 6 in whichthe arms 41 and 42 are in their lower ad ustment. Depression of the leestep or abutmentfor the cessiiry to prove g; reaiwziri'lly b 5/ 1 i 'enothis may be accomplished by moving the s ps 4? so i; the lli s 2i Willengage against the forward ends thereof. The link (Fig. 6) found in thei'necliine extends obliquely downwardly and forwardly, and isreeipiwcnted at each operation of the type C213. riers and rocks. Imodify this link 3y forming a so" ace which operates inst the rollei 4E0withou moving the 1 39 until nee (he form stroke of the in r. at whichtime a cam no on the link quickly oscillates the arm 39 and thereby thetwo fi'ljlI'lS ell and Y llnring ordinary addition this ope ion on thepart of the arms ll and {l2 ps1 wees no effect upon the steps all.However should the key 31 be depressed and th owns 111 and raised as 1srevionslydescr ,d the on is of the arms 45 will be innnedmlely in frontof the shonlders s9 on the stops 17. When so adjusted and'the typecarriers and rocks and the linl: 54-. are moved iorwzirdly the arms willhe lo e-en against the shoulders 4. with shincie force to swing thestops 4;? to their lower position as shown in Fig. 12, the de- Lentlatch spring 51 pern'iittinq and holdi..; the stops in l positioned thestops and will act as aha the racks and thereby movement of the meltswhi elie carrying;

e carriage has l1 ate 5? (Figs, (5 and 7) attached to its rear andextending above the ezirri so ljl1fllL "\'-7l1ll C211- inovedleilivor(ll. v in setting up numbers therein, said plate is movedsuccessively under the stops i! Said plate tends to e sufficientlHIlglll, to constitute 21 stops -1 imder which it becomes positionedthereby pre- Yenting such steps fron'i lowered. This arrengoz'nent isintended to permit c111."- rying or transferring: from lower to higherorders in that part of the adding mechanism which is to be operated.

Tl llQD the link 5d moved forwardly with the type carriers and rocks thecam on sa'd link will swine the minis and rim is i'enrimrdly. (3p lieyarms .which said abutment plate extends will be supported in position toregister with the notches 53 in the heels 24: the racks. In Fig. 10 isillustrated the relative positions of the stops and the abutment plateshowing the stops supported by said plate to regis' ter with the notchesin the heels of the rocks, While in Fig. 12 the stops are showndepressed to constitute afbutinents for heels on the racks to preventbackward movement and thereby prevent carrying in the adding mechanism.In this Way carrying will be interrupted beyond the number introducedinto the ridding mechanism Whenever the subtraction key is depressed.When the subtraction key is released, the spring 5?- restores said keyand the parts operated thereby to idle position, rocking the eccentric37 ell'eetively to move the arms 1-1 and. 42 to their lower positions,bringing the rearward extension. of the plate d8 in front of theshoulders 48 which are above the shaft 46. The next operation of thelink 5 which is necessary to restore the racks to their idle positionswill swing the arms 41 and 412 i-ezirwardly and cause the plate toengage the shoulders 48 as shown in Fig. 12,

and restore the stoos 4-7 to their idle osill in the siiv ordersoconpied by the carriage will be upheld by the plate 5'? so that theracks 14.- in the some six orders may operate in carrying ortransferring operations, 0 eration of said racks in carrying ortransferring" operations takes place because the stops 4'? which aresupported :oy the plate 57 will. be received in the notches 53, therebypermitting the rocks in sa d' six orders to more rcarwzirdly incarrying'for transferring throughout said six order 'lhis is true inWhatever position the .eo i age may he, so that the position of the'riz'ige determines which stops 427 shall be LQ'tfllnfid in position topermit transferring or] carrying operations by the rocks 14. $110238 47which are not supp-o d by the plots 5'? are controlled by the l,uhtrmtinkey 31 and its connections to prevent o 'ryir 3 or transferjheyond theorder to Whiz-n earrings 2; been moi/ed The stop 47 in units order isadjusted so that its normal or idle position is above the notch 53 onthe units rack. This adjustment is provided for the reason thatordinarily carrying or transferring into units order does not occur, andtherefore the units rack never moves rearwarclly beyond its normal oridle position in performing examples of ordinary addition ormultiplication. When the arms 41 and 42 are raised and are swungrearwardly as above described, the arm 45 for units stop will engage theshoulder 49 on said stop and move said stop into alinement with thenotch 53 in the heel of units rack. \Vhen the racks move rearwardlyafter this operation, units rack travels one step or space beyond itsidle or normal position which is effective to introduce or add 1 in theunits adding wheel in addition to the unit which hadbeen set up in thecarriage or which was previously .represepted in said unit-s addingwheel.

In operating this machine to perform examples of subtraction, theminuend number or the series of numbers whose total constitutes theminuend are introduced into the adding mechanism through operation ofthe carriage 4 and the racks 14 in the usual way. Then the complement ofthe subtrahend number including 9s up to the highest order of theminuend is set up in the carriage, then the subtraction key 31 will bedepressed to adjustthe stops 47 to prevent carrying beyond the highestorder in the adding mechanism, and said complementary number in troducedor added into the adding mcchanism. This operation causes the addingmechanism to produce or determine the difference or remainder betweenthe subtrahend and the minuend.

To facilitate the selection of the complementary numbers, I arrange thekeys each with two characters thereon as shown in Fig. 2, the upper orlarger characters indicating the positive values of the respective keys,while the lower characters indicate the digits of which the upper digitsare the complements. The minuend number therefore will be introducedinto the machine by striking the keys indicating such number by thedigits uppermost on the keys, while the subtrahend complement will beintroduced into the machine by operation of the keys indicating thesubtrahend by small or lower characters. It will be remembered, however,that the operator must set up as many extends to the sixth order whilethe subtrahend extends only to the fifth order, requires that theoperator in setting up the subtrahend complement shall set up one orderin addition which shall contain the digit 9. The subtrahcnd complementas shown at C is readily determined by reference to the small characterson the keyboard.

These machines also contain a device comprising a lever or key 58 whichis operable effectively to interrupt operation of the printing hammers2'7 and thereby prevent record of any number introduced into the addingwheels as shown in Fig. 2. Theexample of subtraction is performedwithout recording the subtrahend complement, and this is effected by useof this well known device found in these machines. For convenience ofoperation I have located the subtraction key 31 adjacent to thenon-printing device 58, so that the operator may manipu-v late both ofsaid devices by the use of one hand.

T hcse machines also contain mechanism for holding the adding wheels 28inoperative when any record is being produced, and by embodying mypresent invention in such' machines I am enabled to record the subtrahend number itself without interfering with the proper operation ofthe machine when the complementary number is introduced. Figs. 3 and ashow examples in which the minuend and subtrahejnd both are recorded,the character E at the left indicating that the subtrahend has not beenadded into the adding mechanism.

After the remainder number has been de termined as shown at D in Figs. 3and 4:, said. number may be recorded in the same way that totals arerecorded. The mechanism for recording the totals and remaindcrscomprises a totals-recording key 59 arranged in the keyboard andoperatively con nected through a series of levers 60 with a link 61which extends to the rear of the machine and is pivoted to an arm 62 ona shaft 63. The arm 62 projects above the shaft 63 and with another arm64: supports a rod 65. The pivoted plate 30 in the carriage t isconnected with a sliding plate 66 by a pin on said plate 30 extendinginto an oblique slot 67 in said sliding plate. The sliding plate isactuated rearwardly by a spring and thereby holds the plate 30 normallyin front of the heels 24 on the racks when the carriage is in its idleposition. Depression of the totals-recording key will cause the rod 65to push the plate 66 forward and thereby depress the detaining plate 30below the heels of the racks and permit'the latter to be moved forwardlyin the usual way to record the total or number represented in the addingwheels and restore said wheels to clear condition.

I am aware that there may be modifica' tions and alterations in theconstruction 13;;

this invention Without '1. In a machine of tl lass mentioned,

1e 0 adding mechanism opera 'le to carry or transfer from lower tohigher orders throughout, and a lrey for interrupting car rying ortransferring at any desired point in said adding mechanism Whenever anynumber is introduced therein, substantially as described.

2. In a machine of the character described, devices operable torepresent numbers, adding mechanism operable to carry or transfer fromlower to higher orders throughout, means for introducing numbersrepresented by said devices into said. adding mechanism, and a lreyadjustable to interrupt carrying beyond. the highest order of any numberso introduced, substantially as described.

3. In an adding machine, a carriage, devices in said carriage adjustableto represent numbers, recording mechanism, means for operating saidrecording mechanism to record a number represented in said can riage,adding mechanism operated incidentally to the operat n of said recordingmechanism, and mar ailative inc-ans Where by the digit added in unitsorder maybe increased one unit over the digit recorded, in subtractingoperations, substantially as described.

4:. In an adding machine, adding mechanism, mechanism for causing saidadding mechanism to add numbers and to transfer or carry from lower tohigher orders, a key, and means controlled by said key eiiectively tointerrupt transferring or carrying at any order in said addingmechanism, the order at which the interruption is eiiected beingautomatically determined.

5. In an adding machine, the co1nbination with adding mechanism operableto add numbers and to transfer from lower to higher orders, or" asubtraction key, and devices adjustable thereby whereby carryinginsaidadding mechanism may be in terruptcd' or prevented beyond the. highestorder of any number in said adding mechanism.

6. In a machine of the character described, a movable carriage, devicesoperable to set up numbers in said carriage, adding mechanism, means foroperating said adding mechanism to add the numbers set up in saidcarriage, and means for preventing carrying or transferring in saidadding mechanism in certain instances, substantially as described. I

7. In a machine of the character deinsane a carriage, means to up nuns:hers in carriage, adding mechanism, s for operating adding nieehanism toadd numbers set up in. the carriage, and devices adjustable insubtracting to prevent carryi. from lower to said adding mechanisr amachine of the character de scribed, a movable devices able in saidcarriage to represent numoers,

adding mechanism, operable erlec tively to introduce into said addingmocha nism the numbers set up in the carriage and to carry or transferfrom. lower to higher orders in addine, and means for preventing saidracks irom operating to ders in performing functions ofaddition,

of devices adjustablev to prevent carrying beyond the highest order ofthe number being added While permitting transferring up to thehighestorder of said number and a single key controlling said devices.

11. in an adding machine, the combina tion with adding and recordingdevices, of a series of stops, and a keyfor adjusting said stops toprevent carrying from lowerto higher orders by said adding devices,substantially as described.

12. In an. adding machine, the combinaticn with adding mechanism, racksfor operating said adding mechanism to introduce numbers therein and tocarry from lower'to higher orders, or a-series of stops, and means foradjusting said stops to prevent said' racks from operating to carry,substantially s described. I

13. In an adding machine, the combination with adding Wheels, racks foroperating; said Wheels to add numbers and to carry from lower to higherorders, and mechanism for recording the numbers added, of mechanismadjustable in subtracting operations to prevent carrying beyond theminuend numher when said adding mechanism is operated, substantially asdescribed.

14. In an adding machine, the combine? tion with addingwheels, racks foroperating said Wheels to add numbers and to transfer from lower tohigher orders, a carriage controlling the operation of said racks in onedirection, and mechanism. for recording the icenumbers addcd, ofmechanism adjustable in subtracting operations to prevent carryingbeyond a predetermined point in the adding mechanism.

15. In an adding machine, multiple order.

adding mechanism, means for carrying from lower to higher orders in saidadding mechanism, a carriage whose operation is necessary before saidadding mechanism may be operated, and means for preventing carrying anyorders beyond the position of said carriage.

16. In an adding machine, adding mecha nism, means for carrying fromlower to higher orders in said adding mechanism, a carriage whoseOperation is necessary before said adding mechanism may be operated,means for moving said carriage, step by step, from lower to higherorders, and means for preventing operation ofsaid carrying meansrbeyondthe order to which said carriage has been moved. I

17. In an adding machine, the combination with adding and recordingmechanism, a, carriage .Whose operation is necessary before saidmechanism may be operated, and means for operating said carriage, of aseries of stops, a key for adjusting said stops to prevent carrying fromlower to higher orders by said adding mechanism as determined by theposition of said carriage, substantially as specified.

18. In an adding machine, the combination with mechanism operable torecord nun bers, adding mechanism operable to add the numbers recordedand to transfer from lower to higher orders performing functions ofaddition, a carriage whose operation is necessary before said recdrdingand adding mechanism may be operated and. means for operating saidcarriage, of devices adjustable to prevent carrying beyond the highestorder of the number belng added waile permitting carrying up to thehighest order of said number as determined by the position of saidcarriage.

19. The combination. with mechanism operable to record numbers, addingmechanism operable to add the numbers recorded and to transfer fromlower to higher orders in performing functions of addition, a carriagewhose operation is necessary before said adding and recording mechanismmay be operated and means for operating said carriage, of devicesadjustable to prevent carrying beyond the highest order of the numberbeing added while permitting carrying up to'the highest order of saidnumber as determined by the position of said carriage, and a key foroperating said devices, sub stantially as specified.

20. In an adding machine, the combination with adding wheels, racks foroperating said wheels to add numbers and to carry from lower to higherorders, mechanism for recording the numbers added, a carriage whoseoperation is necessary before any number may be added or recorded andmeans for operating said carriage, of subtracting mechanism adjustableto prevent carryingbeyond the minuend number when said adding mechanism1s operated in subtracting operations, and means in said carriageconsaid wheels to add numbers and to carry from lower to higher orders,springs for operating said racks in carrying operations, a carriagewhose operation is. necessary before said racks may be operated andmeans for operating said carriage, of subtracting mechanism adjustableto preventcarryin beyond the minuend number when said ad ing mechanismis operated, and means in said carriage controlling said subtractingmechanism. to enable said racks to operate said adding wheels to anorder determined by the position of said carriage, substantiallyasspecified'.

22. In an adding machine, the combination with adding wheels, racks foroperating said Wheels to add numbers and to carry from lower to higherorders, springs for operating said racks, a carriage whose operation isnecessary before said racks may be operated and means for operating saidcarriage, of a series of stops, a key, and connections controlled bysaid key to. prevent carrying beyond thehighest order of the numberbeing added as determined by the position of saidwarriage.

In an adding machine, the combination with adding wheels, racks foroperating said adding wheels in adding and transferring operations, anda stop for each rack, of a carriage for controlling the racks in addingoperations, means for adjusting said stops to prevent operation of saidracks in transferring operations, and means in said carriage to preventadjustment of stops in the numerical orders occupied by said carriage.

In testimon whereof, I hereunto aflix my signatu re to t iisspecification this tenth day of June, 1909, in the presence of twowitnesses.

BIR-NEY DYSART. [Ls] -Witnesses:

J. D. RIPPEY, L. C. Krn'senann.

